Rapper/actor Nick Cannon is desperate to start a family with his new wife Mariah Carey, according the star's half-brother.

Reuben Cannon says his newly-wed brother "definitely wants kids" with the Hero hitmaker and is excited about becoming a first time father.

He tells Usmagazine.com, "I am not sure exactly if now is the time. Both of their careers are crazy right now."

And Reuben also claims Cannon has always loved Carey - he has been a longtime fan of her music.

He adds, "He was a fan. He loves her more than any other girl."